<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区 -->
            <el-form ref="loginFormRef" label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <!-- 按钮区 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                //绑定登录用户和密码数据
                loginForm: {
                    username: 'admin',
                    password: '123456'
                },
                //定义表单验证规则
                loginFormRules: {
                    //用户名校验规则，trigger是何时进行校验，blur是失去焦点时
                    username: [
                        { required: true, message: '请输入用户名', trigger: 'blur' },
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    password: [
                        { required: true, message: '请输入密码', trigger: 'blur' },
                        { min: 6, max: 15, message: '长度在 3 到 15个字符', trigger: 'blur' }
                    ]
                }
            }
        },
        methods: {
            //重置登录表单数据
            resetLoginForm() {
                this.$refs.loginFormRef.resetFields()
            },
            //登录验证函数
            login() {
                //使用async处理返回的promise对象
                this.$refs.loginFormRef.validate(async valid => {
                    if (!valid) return
                    //使用解构赋值使res等于async返回的对象中的axios封装对象中的data
                    const { data: res } = await this.$http.post('login', this.loginForm)
                    if (res.meta.status !== 200) return this.$message.error('登录失败')
                    this.$message.success('登录成功')
                    //把服务器返回的token保存到本地
                    //console.log(res)
                    window.sessionStorage.setItem('token', res.data.token)
                    //再把路由地址跳转到 home主页面
                    this.$router.push('/home')
                })
            }
        },
    }
</script>

<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }

    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }

    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
    }

    .avatar_box img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;

    }

    .btns {
        display: flex;
        justify-content: flex-end;
    }

    .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
</style>